Device encryption protects data stored on a device by making it unreadable without the right unlock method. Windows Device Encryption and BitLocker are examples. Encryption is most valuable when a powered-off or locked laptop is lost or stolen; it does not stop malware or someone who can use your already-unlocked session.
A useful example
A stolen laptop's drive is removed and connected to another computer. If drive encryption was correctly enabled, its files should remain inaccessible without the key. If the laptop was unlocked when taken, treat accounts and data as potentially exposed regardless of encryption.
Check before you rely on it
Verify the status in Windows settings and know where the recovery key is stored. Keep a separate backup of important files; encryption does not replace backup and a missing recovery key can lock out the rightful owner. Microsoft's
BitLocker overview explains protection and recovery. On a managed work device, ask IT before changing settings.
Practical distinction
Before traveling, check that encryption says it is active and that you can locate the recovery key. Do not test the key by deliberately locking yourself out.
